it does not !
transponder always answers with Flight Level.
The controlers 'display' normaly corects .
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4 c.
c + c + c + c + c = 5 * c.
8 c on a c
a = 3b - c a + c = 3b - c + c a + c = 3b (a + c)/3 = 3b/3 ( a + c ) / 3 = b Do your homework.
b + b + b + c + c + c + c = 3b + 4c